Mostly 3-5 story apartment houses with occasional mid- to high-rises and single-family dwellings. Examples: northeast San Francisco (Russian, Nob and Telegraph Hills, North Beach), River North in Chicago, Beacon Hill in Boston, along Connecticut Ave. in DC, and compact neighborhoods throughout the country.

500

Mostly mid- to high-rises. Examples: the Upper East and West Sides in Manhattan, and smaller neighborhoods in Chicago, San Francisco and elsewhere.